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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
No, your code is wrong and it fails with some input values (not with that one). Not a kata issue.
Use a simple loop, the return of forEach isn't working as you think it should.